bones
joints
100
a bone disease in which your bones weaken as you age.
what is osteoperosis
100
a type of joint that allows forward and backward motion in your knee and elbow.
What is hinge joint
200
a bone with small spaces that is lightweight and durable
what is spongy bone
200
a joint the allows you to move your arm freely
What is ball-and-socket joint
300
soft connective tissue in the bone
What is marrow
400
the bone that is hard and dense but not solid
What is compact bone
500
there are_____types of marrow
What is two
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